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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d6dc82a07b178dc5f96116cefdd4d93651c8abf71f555f33e89de8de9f44e27' 
  AND token = 'XGyvC9eLDmSmd36Y4HO52IMrORk+kT54zxezXxxN41U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}